Influencing Factors of High-Energy Ignition in Lean-Burn Gasoline Engine

WU Xijiang; WANG Zhiyu; YIN Qi

doi:10.3969/j.issn.1001-2222.2020.05.001

Vehicle Engine ›› 2020, Vol. 0 ›› Issue (5) : 1-10. DOI: 10.3969/j.issn.1001-2222.2020.05.001

Influencing Factors of High-Energy Ignition in Lean-Burn Gasoline Engine

WU Xijiang,WANG Zhiyu,YIN Qi

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Abstract

The crucial factors of high-energy ignition applied on homogeneous leanburn gasoline engine were investigated on an optical single-cylinder engine. A conventional ignition system and two other highenergy ignition systems with variable energy and continuous discharge were compared by means of combustion analysis and high speed photography. The experimental results indicate that boosting the spark discharge power level is the most effective way to enhance ignition energy and improve combustion stability. Meanwhile, the utilization rate of high-energy ignition system is higher at low speed and low load due to longer combustion duration, which results in a faster and more stable combustion process and an extra extended leanburn limit. Besides, since the spark plug type and orientation also influence the formation of spark channel and the development of early flame, a pintopin spark plug with larger electrode spacing and spark plug with electrode gap back to the intake side are suggested, which can improve the combustion velocity and stability.

Key words

gasoline engine / lean burn / high-energy ignition / spark channel / combustion stability / lean-burn limit

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WU Xijiang,WANG Zhiyu,YIN Qi. Influencing Factors of High-Energy Ignition in Lean-Burn Gasoline Engine[J]. Vehicle Engine. 2020, 0(5): 1-10 https://doi.org/10.3969/j.issn.1001-2222.2020.05.001